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Derivative Financial Instruments and Fair Value Measurements (Details) € in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 EUR (€) | Dec. 31, 2014 USD ($)
Net investment hedges [Abstract] |  |  |  |  |  |
Translation loss on net investment hedge | $ (3.6) |  | $ (3.6) |  |  | $ (24.5)
Recurring Basis [Member] |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |
Deferred compensation plan assets | 86.6 |  | 86.6 |  |  | 81.4
Foreign currency forward contracts | 2.0 |  | 2.0 |  |  | 0.1
Total assets | 88.6 |  | 88.6 |  |  | 81.5
Liabilities [Abstract] |  |  |  |  |  |
Foreign currency forward contracts | 0.4 |  | 0.4 |  |  |
Total liabilities | 0.4 |  | 0.4 |  |  |
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |
Deferred compensation plan assets | 86.6 |  | 86.6 |  |  | 81.4
Foreign currency forward contracts | 0.0 |  | 0.0 |  |  | 0.0
Total assets | 86.6 |  | 86.6 |  |  | 81.4
Liabilities [Abstract] |  |  |  |  |  |
Foreign currency forward contracts | 0.0 |  | 0.0 |  |  |
Total liabilities | 0.0 |  | 0.0 |  |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |
Deferred compensation plan assets | 0.0 |  | 0.0 |  |  | 0.0
Foreign currency forward contracts | 2.0 |  | 2.0 |  |  | 0.1
Total assets | 2.0 |  | 2.0 |  |  | 0.1
Liabilities [Abstract] |  |  |  |  |  |
Foreign currency forward contracts | 0.4 |  | 0.4 |  |  |
Total liabilities | 0.4 |  | 0.4 |  |  |
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |
Deferred compensation plan assets | 0.0 |  | 0.0 |  |  | 0.0
Foreign currency forward contracts | 0.0 |  | 0.0 |  |  | 0.0
Total assets | 0.0 |  | 0.0 |  |  | 0.0
Liabilities [Abstract] |  |  |  |  |  |
Foreign currency forward contracts | 0.0 |  | 0.0 |  |  |
Total liabilities | 0.0 |  | 0.0 |  |  |
Euro-denominated Note EUR350.0 [Member] |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Long-term debt | 390.1 |  | 390.1 |  | € 350.0 |
Translation loss on net investment hedge | (3.5) |  | (3.5) |  |  | (24.5)
Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Gain (loss) associated with forward contracts included in interest and other expenses | 1.6 | $ 0.2 | 1.8 | $ 0.2 |  |
Forward Contracts [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Translation loss on net investment hedge | (0.1) |  | (0.1) |  |  |
Fair Value [Member] | Euro-denominated Note EUR350.0 [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |  |
Notes payable | 430.3 |  | 430.3 |  |  | 471.6
Carrying Value [Member] | Euro-denominated Note EUR350.0 [Member] |  |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |  |
Notes payable | $ 390.1 |  | $ 390.1 |  |  | $ 423.4

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